<template>
  <div
    class="xtx-carousel"
    @mouseenter="mouseEvent(true)"
    @mouseleave="mouseEvent(false)"
  >
    <ul class="carousel-body">
      <li
        class="carousel-item"
        :class="{ fade: Index === index }"
        v-for="(item, index) in props.sliders"
        :key="index"
      >
        <!-- 图片 -->
        <RouterLink v-if="item.hrefUrl" :to="item.hrefUrl">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>
        <!-- 商品列表 -->
        <div v-else class="slider">
          <RouterLink
            v-for="goods in item"
            :key="goods.id"
            :to="`/product/${goods.id}`"
          >
            <img :src="goods.picture" alt="" />
            <p class="name ellipsis">{{ goods.name }}</p>
            <p class="price">&yen;{{ goods.price }}</p>
          </RouterLink>
        </div>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev"
      ><i class="iconfont icon-angle-left" @click="toggle(-1)"></i
    ></a>
    <a href="javascript:;" class="carousel-btn next"
      ><i class="iconfont icon-angle-right" @click="toggle(1)"></i
    ></a>
    <div class="carousel-indicator">
      <template v-for="(item, i) in props.sliders" :key="i">
        <span @click="Index = i" :class="{ active: Index === i }"></span>
      </template>
    </div>
  </div>
</template>

<script lang="ts">
export default {
  name: 'carousel'
};
</script>
<script lang="ts" setup>
import { defineProps, ref, withDefaults, watch, onUnmounted } from 'vue';
interface Props {
  sliders: any[]; // 轮播图数据
  autoplay?: boolean; // 是否自动播放
  duration?: number;
}
const props = withDefaults(defineProps<Props>(), {
  sliders: <any>[],
  autoplay: false,
  duration: 3000
});
// 图片的索引值
const Index = ref(0);

// 自动播放函数
let timer: any = null; // 保存定时器
const autoPlayFn = () => {
  clearInterval(timer);
  // 设置定时器 用于自动播放图片
  timer = setInterval(() => {
    Index.value++;
    if (Index.value >= props.sliders.length) {
      Index.value = 0;
    }
  }, props.duration);
};
// 自动播放的条件: sliders数据变化 且autoplay 为 true
watch(
  () => props.sliders,
  (n) => {
    if (n.length && props.autoplay) {
      autoPlayFn();
    }
  },
  {
    immediate: true
  }
);

// 2. 鼠标离开和进入添加时间和删除事件
const mouseEvent = (v: boolean) => {
  if (v && timer && props.autoplay) {
    // 清楚定时器
    clearInterval(timer);
  } else if (props.sliders.length && props.autoplay) {
    // 启动自动循环
    autoPlayFn();
  }
};

const toggle = (index: number) => {
  // if(Index.value <= 0) {
  //   Index.value = props.sliders.length
  // } else if (Index.value >=  props.sliders.length){
  //   Index.value = 0
  // }
  const newValue = Index.value + index;
  // 超出索引
  if (newValue > props.sliders.length - 1) {
    Index.value = 0;
    return;
  }
  // 少于索引
  if (newValue < 0) {
    Index.value = props.sliders.length - 1;
    return;
  }
  // 正常
  Index.value = newValue;
};
onUnmounted(() => {
  // 卸载组件时清楚定时器
  clearInterval(timer);
});
</script>
<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
// 轮播商品
.slider {
  display: flex;
  justify-content: space-around;
  padding: 0 40px;
  > a {
    width: 240px;
    text-align: center;
    img {
      padding: 20px;
      width: 230px !important;
      height: 230px !important;
    }
    .name {
      font-size: 16px;
      color: #666;
      padding: 0 40px;
    }
    .price {
      font-size: 16px;
      color: #cf4444;
      margin-top: 15px;
    }
  }
}
</style>
